Nameko, and why that slimy layer is exactly the point

The first reaction to a nameko is almost always the same: is it normal for it to be this slimy? Yes. The Japanese nameko, Pholiota nameko, has a thick, glossy coating on cap and stem that feels like jelly, and that coating is not a flaw but its trademark. In Japan, nameko is one of the most cultivated mushrooms after shiitake and enoki, and the reason it floats in nearly every bowl of miso soup there is exactly what makes people hesitate here. Portrait of a species you need a moment to get to know.

What does nameko look like?

Small to medium caps of two to five centimetres, orange-brown to chestnut, glossy and covered in a clear layer of slime when moist. They grow in dense clusters, dozens at a time, on dead broadleaf wood. The stem is pale with a faint ring. Young caps are domed and closed, which is the moment to harvest; open caps are still edible but softer and less pretty. Beneath the slime, the mushroom is firm, almost crunchy.

Why is that layer the point?

The slime consists of polysaccharides, long sugar chains that bind water, and in Japanese cooking that property is the whole reason for its existence. Nameko in miso soup naturally makes the soup lightly thickened, smooth and full, with no need for flour or cornstarch. In a bowl of noodles the coating gives the broth a silky texture. The Japanese prize that texture, nurunuru, the way we prize a creamy sauce. Wash a nameko until the slime is gone and you throw away the best part. That said, a quick rinse to remove substrate does no harm; the layer simply returns in the soup.

Where and how do you grow it?

On logs, outdoors, in the cold. Nameko is a cold-loving species that fruits at 8 to 15 degrees, so in north-west Europe from October to December and sometimes in early spring. It likes beech, poplar, alder and willow, and a damp, shady spot. A classic method is to bury the log one third deep so it draws moisture from the soil, or lay it flat on the ground under a layer of leaves. In a dead hedge it feels perfectly at home. Inoculate in February or March with plug spawn, following the instructions, and expect the first clusters in the second autumn. After that a log produces for three to four years. If you prefer working indoors, spawn on sawdust or supplemented straw works, but the cold fruiting makes outdoors the better place.

How do you eat nameko?

In liquid, almost always. Miso soup is the classic: stock, miso, a handful of nameko added in the last two minutes, done. Also in ramen, in a Japanese breakfast of rice and soup, or in a stew as a thickener. Frying works too, short and hot, but then you lose the texture that makes it special. The flavour is mild, faintly nutty, with a hint of earth. Store briefly: fresh nameko lasts only two to three days before the slime turns cloudy. Blanch any surplus for two minutes and freeze it; drying does not work for this species.

Who is nameko for?

Anyone with a beech log who still wants to harvest in late autumn, when the oysters are done and the velvet shank has yet to begin. Anyone who loves Japanese food and knows the difference between tinned nameko and nameko from a log; that difference is big. And anyone who wants a species that needs little care: once inoculated and laid in a damp spot, a nameko log looks after itself. Honestly, it is not a species to impress a birthday party. It is the species for a bowl of soup on a grey November evening, and there is nothing wrong with that.